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Update versions doc with k8s v1.27 notes
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Signed-off by: Furkat Gofurov ([email protected])

(cherry picked from commit af03bdd)
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furkatgofurov7 committed Apr 17, 2023
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81 changes: 44 additions & 37 deletions docs/book/src/reference/versions.md
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Expand Up @@ -24,10 +24,10 @@ When a new Kubernetes minor release is available, we will try to support it in a
the corresponding required changes in Cluster API are too invasive we won't backport the support and users have to wait
for the next Cluster API minor release.

For example, Cluster API v1.4.0 would support the following Kubernetes versions:
* v1.23.x to v1.26.x for the management cluster
* v1.21.x to v1.26.x for the workload cluster
* When Kubernetes 1.27 is released, it will be supported in v1.4.x (but not in v1.3.x)
For example, Cluster API v1.5.0 would support the following Kubernetes versions:
* v1.24.x to v1.27.x for the management cluster
* v1.22.x to v1.27.x for the workload cluster
* When Kubernetes 1.28 is released, it will be supported in v1.5.x (but not in v1.4.x)

Support in this context means that we:
* maintain corresponding code paths
Expand Down Expand Up @@ -72,17 +72,18 @@ These diagrams show the relationships between components in a Cluster API releas

#### Core Provider (`cluster-api-controller`)

| | v1.1 (v1beta1) (EOL) | v1.2 (v1beta1) | v1.3 (v1beta1) | v1.4 (v1beta1) |
|-------------------|----------------------|-------------------|-------------------|-------------------|
| Kubernetes v1.18 | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.19 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.20 | ✓ | ✓ | ✓ | |
| Kubernetes v1.21 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.22 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.23* | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.24 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.25 | | ✓ | ✓ | ✓ |
| Kubernetes v1.26 | | ✓ | ✓ | ✓ |
| | v1.1 (v1beta1) (EOL) | v1.2 (v1beta1) | v1.3 (v1beta1) | v1.4 (v1beta1) |
|-------------------|----------------------|-------------------|-------------------|-------------------------|
| Kubernetes v1.18 | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.19 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.20 | ✓ | ✓ | ✓ | |
| Kubernetes v1.21 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.22 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.23* | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.24 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.25 | | ✓ | ✓ | ✓ |
| Kubernetes v1.26 | | ✓ | ✓ | ✓ |
| Kubernetes v1.27 | | | | ✓ (from v1.4.2 release) |


\* There is an issue with CRDs in Kubernetes v1.23.{0-2}. ClusterClass with patches is affected by that (for more details please see [this issue](https://github.com/kubernetes-sigs/cluster-api/issues/5990)). Therefore we recommend to use Kubernetes v1.23.3+ with ClusterClass.
Expand All @@ -94,33 +95,36 @@ The Core Provider also talks to API server of every Workload Cluster. Therefore,

#### Kubeadm Bootstrap Provider (`kubeadm-bootstrap-controller`)

| | v1.1 (v1beta1) (EOL) | v1.2 (v1beta1) | v1.3 (v1beta1) | v1.4 (v1beta1) |
|------------------------------------|----------------------|-------------------|-------------------|--------------------|
| Kubernetes v1.18 + kubeadm/v1beta2 | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.19 + kubeadm/v1beta2 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.20 + kubeadm/v1beta2 | ✓ | ✓ | ✓ | |
| Kubernetes v1.21 + kubeadm/v1beta2 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.22 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.25 + kubeadm/v1beta3 | | ✓ | ✓ | ✓ |
| Kubernetes v1.26 + kubeadm/v1beta3 | | ✓ | ✓ | ✓ |
| | v1.1 (v1beta1) (EOL) | v1.2 (v1beta1) | v1.3 (v1beta1) | v1.4 (v1beta1) |
|------------------------------------|----------------------|-------------------|-------------------|-------------------------|
| Kubernetes v1.18 + kubeadm/v1beta2 | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.19 + kubeadm/v1beta2 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.20 + kubeadm/v1beta2 | ✓ | ✓ | ✓ | |
| Kubernetes v1.21 + kubeadm/v1beta2 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.22 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.25 + kubeadm/v1beta3 | | ✓ | ✓ | ✓ |
| Kubernetes v1.26 + kubeadm/v1beta3 | | ✓ | ✓ | ✓ |
| Kubernetes v1.27 + kubeadm/v1beta3 | | | | ✓ (from v1.4.2 release) |


The Kubeadm Bootstrap Provider generates kubeadm configuration using the API version recommended for the target Kubernetes version.

#### Kubeadm Control Plane Provider (`kubeadm-control-plane-controller`)

| | v1.1 (v1beta1) (EOL) | v1.2 (v1beta1) | v1.3 (v1beta1) | v1.4 (v1beta1) |
|----------------------------|----------------------|-------------------|-------------------|-------------------|
| Kubernetes v1.18 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.19 + etcd/v3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.20 + etcd/v3 | ✓ | ✓ | ✓ | |
| Kubernetes v1.21 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.22 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.23 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.24 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.25 + etcd/v3 | | ✓ | ✓ | ✓ |
| Kubernetes v1.26 + etcd/v3 | | ✓ | ✓ | ✓ |
| | v1.1 (v1beta1) (EOL) | v1.2 (v1beta1) | v1.3 (v1beta1) | v1.4 (v1beta1) |
|----------------------------|----------------------|-------------------|-------------------|-------------------------|
| Kubernetes v1.18 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.19 + etcd/v3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.20 + etcd/v3 | ✓ | ✓ | ✓ | |
| Kubernetes v1.21 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.22 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.23 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.24 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.25 + etcd/v3 | | ✓ | ✓ | ✓ |
| Kubernetes v1.26 + etcd/v3 | | ✓ | ✓ | ✓ |
| Kubernetes v1.27 + etcd/v3 | | | | ✓ (from v1.4.2 release) |

The Kubeadm Control Plane Provider talks to the API server and etcd members of every Workload Cluster whose control plane it owns. It uses the etcd v3 API.

Expand All @@ -142,6 +146,9 @@ The Kubeadm Control Plane requires the Kubeadm Bootstrap Provider.

#### Kubernetes version specific notes

**1.27**:
* No specific notes

**1.26**:
* No specific notes

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